A method for strengthening treatment of copper anode slime by direct microwave irradiation

Abstract

The invention discloses a method for carrying out strengthening treatment on copper anode mud through direct microwave irradiation. The method comprises the following steps of (1) irradiating the copper anode mud under a microwave condition; (2) blending the copper anode mud subjected to microwave irradiation by using a sulfuric acid solution to prepare slurry; and (3) introducing oxygen or adding an oxidant into the slurry under a stirring condition to leach; and carrying out solid-liquid separation after finishing the leaching operation to obtain leachate containing copper, tellurium and selenium. By using the method disclosed by the invention, most of copper, tellurium and selenium in the copper anode mud can be leached, the leachate and leaching residues strengthened through microwave pretreatment are easily treated, the subsequent precious metal extracting process is greatly simplified, the production cost is low, the treatment time is short, and therefore, the method is an environment-friendly pretreatment process.

Description

technical field [0001] The invention relates to a method for treating copper anode slime, in particular to a method for intensively treating copper anode slime by direct microwave irradiation. Background technique [0002] The anode slime produced in the copper electrolytic refining process has become an important raw material for extracting rare and precious metals because it contains a large amount of precious metals, rare metals and platinum group metals; in addition, tellurium and selenium are very precious scattered metals with high value. It is also an important metal. [0003] The pretreatment of copper anode slime is the first step and one of the most important steps in the whole process of extracting valuable metals; the purpose of pretreatment is mainly to remove copper, tellurium, selenium and other metals in copper anode slime and to obtain precious metals Enrichment provides convenient conditions for the subsequent extraction of precious metals. [0004] For t...

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Problems solved by technology

[0004] For the pretreatment process of copper anode slime, at present, more methods are used at home and abroad, such as sulfate roasting-sulfuric acid leaching method, oxidation roasting-sulfuric acid leaching method, atmospheric air stirring sulfuric acid direct leaching method, etc.; traditional fire method pretreatment The process has disadvantages such as high energy consumption, poor operating environment, poor raw material adaptability, and environmental pollution, which is still a worldwide technical problem; the traditional wet pretreatment process has low leaching rate, long reaction time, and low efficiency. Disadvantage, it takes 24 hours or even longer to complete the copper removal